Function unescapeTagValue

unescapeTagValue(value: string): string
Unescapes a tag value read from the wire per the IRCv3 message-tags spec.

Reverses escapeTagValue: \: -> ;, \s -> space, \\ -> \, \r -> CR, \n -> LF. An unrecognized escape drops the backslash and keeps the following character; a trailing lone backslash is dropped.
Parameters
- value: string
  The escaped tag value.
Returns string
The decoded literal value.
Since
1.0.4
Example
```
import { unescapeTagValue } from 'edgeport/irc';

unescapeTagValue('a\\:b\\sc'); // 'a;b c'
```
- Defined in src/irc/message.ts:262